//代码做业
const fp = require('lodash/fp')
// 数据：horsepower 马力，dollar_value 价格，in_stock 库存
const cars = [
    { name: 'Ferrari FF', horsepower: 660, dollar_value: 700000, in_stock: true },
    { name: 'Spyker C12 Zagato', horsepower: 650, dollar_value: 648000, in_stock: false },
    { name: 'Jaguar XKR-S', horsepower: 550, dollar_value: 132000, in_stock: false },
    { name: 'Audi R8', horsepower: 525, dollar_value: 114200, in_stock: false },
    { name: 'Aston Martin One-77', horsepower: 750, dollar_value: 185000, in_stock: true },
    { name: 'Pagani Huayra', horsepower: 700, dollar_value: 130000, in_stock: false }
]
console.log('start')
// 2.1
const lastInStock = fp.flowRight(fp.prop('in_stock'), fp.last)
const res = lastInStock(cars)
console.log(res, 'res')

let isLastInStock = function(cars){
  // 获取最后一条数据
  let last_car = fp.last(cars)
  console.log(last_car)
  // 获取最后一条数据的 in_stock 属性值
  return fp.prop('in_stock', last_car)
}

console.log(lastInStock(cars), 'relastInStocks')
// 练习2
const getName = fp.flowRight(fp.prop('name'), fp.first)
console.log(getName(cars))
// 练习3
let _average = function(xs){
  return fp.reduce(fp.add, 0, xs) / xs.length
}
const getAverValue = fp.flowRight(_average, fp.map(fp.prop('dollar_value')))
console.log(getAverValue(cars), '均值')
// 练习4
let _underscore = fp.replace(/\W+/g, '_')
function sanitizeNames(arr) {
  let resArr = []
  const names = fp.map(fp.flowRight(fp.lowerCase, fp.props('name')), arr)
  return fp.map(_underscore, names)
}
console.log(sanitizeNames(cars), '_ lowercode')